The Moonlight Greatsword is a FromSoftware staple, first appearing in King's Field back in 1994. Since then, From has included the sword in some of its most iconic games, from Dark Souls to Armored Core, so it's no surprise that it has returned nearly three decades later in Fires of Rubicon.
It appeared in the first Armored Core as the LS-99-MOONLIGHT three years after King's Field in 1997 and has since returned in all of its sequels. Armored Core 5 even had three versions. However, despite the blade being a long-running easter egg across From's library, it is best known these days for its appearance in the Soulsborne series.
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It cropped up in Ninja Blade in 2009, and only a week later, in Demon's Souls as the Large Sword of Moonlight. Then it appeared in Dark Souls two years later, simply called the Moonlight Greatsword. Dark Souls 2 had a sword of the same name and a copy, the Bluemoon Greatsword. Bloodborne continued the trend with the Holy Moonlight Sword, lifting its name directly from King's Field, and it surfaced again in Dark Souls 3. While absent in Sekiro, it did pop up in Elden Ring as the Dark Moon Greatsword. And now, you can get it in Armored Core 6.
This discovery was made by John Payne and EJRaven_ACO on Twitter, with a rough translation of the screenshot being provided by Reddit user peetaablah; "A merge of laser and pulse technologies that shoots out a wave. If you charge it, the wave will be stronger and bigger".
A lot of Souls staples originate from previous FromSoftware games, the Moonlight Greatsword being one of the most iconic examples. Another is Patches, the bald trickster that often pushes you off cliffs into dangerous holes
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